std.os.windows: avoid dragging in baggage on non-windows

particularly noticeable when usize is not 4 or 8 bytes

1 files changed, 22 insertions, 19 deletions

diff --git a/lib/std/os/windows.zig b/lib/std/os/windows.zig
index 66583d21b2..5f7c900eb7 100644
--- a/lib/std/os/windows.zig
+++ b/lib/std/os/windows.zig
@@ -4621,25 +4621,28 @@ pub const TEB = extern struct {
 };
 
 comptime {
-    // Offsets taken from WinDbg info and Geoff Chappell[1] (RIP)
-    // [1]: https://www.geoffchappell.com/studies/windows/km/ntoskrnl/inc/api/pebteb/teb/index.htm
-    assert(@offsetOf(TEB, "NtTib") == 0x00);
-    if (@sizeOf(usize) == 4) {
-        assert(@offsetOf(TEB, "EnvironmentPointer") == 0x1C);
-        assert(@offsetOf(TEB, "ClientId") == 0x20);
-        assert(@offsetOf(TEB, "ActiveRpcHandle") == 0x28);
-        assert(@offsetOf(TEB, "ThreadLocalStoragePointer") == 0x2C);
-        assert(@offsetOf(TEB, "ProcessEnvironmentBlock") == 0x30);
-        assert(@offsetOf(TEB, "LastErrorValue") == 0x34);
-        assert(@offsetOf(TEB, "TlsSlots") == 0xe10);
-    } else if (@sizeOf(usize) == 8) {
-        assert(@offsetOf(TEB, "EnvironmentPointer") == 0x38);
-        assert(@offsetOf(TEB, "ClientId") == 0x40);
-        assert(@offsetOf(TEB, "ActiveRpcHandle") == 0x50);
-        assert(@offsetOf(TEB, "ThreadLocalStoragePointer") == 0x58);
-        assert(@offsetOf(TEB, "ProcessEnvironmentBlock") == 0x60);
-        assert(@offsetOf(TEB, "LastErrorValue") == 0x68);
-        assert(@offsetOf(TEB, "TlsSlots") == 0x1480);
+    // This file may be referenced for its error sets, so we must not assume target windows here.
+    if (builtin.os.tag == .windows) {
+        // Offsets taken from WinDbg info and Geoff Chappell[1] (RIP)
+        // [1]: https://www.geoffchappell.com/studies/windows/km/ntoskrnl/inc/api/pebteb/teb/index.htm
+        assert(@offsetOf(TEB, "NtTib") == 0x00);
+        if (@sizeOf(usize) == 4) {
+            assert(@offsetOf(TEB, "EnvironmentPointer") == 0x1C);
+            assert(@offsetOf(TEB, "ClientId") == 0x20);
+            assert(@offsetOf(TEB, "ActiveRpcHandle") == 0x28);
+            assert(@offsetOf(TEB, "ThreadLocalStoragePointer") == 0x2C);
+            assert(@offsetOf(TEB, "ProcessEnvironmentBlock") == 0x30);
+            assert(@offsetOf(TEB, "LastErrorValue") == 0x34);
+            assert(@offsetOf(TEB, "TlsSlots") == 0xe10);
+        } else if (@sizeOf(usize) == 8) {
+            assert(@offsetOf(TEB, "EnvironmentPointer") == 0x38);
+            assert(@offsetOf(TEB, "ClientId") == 0x40);
+            assert(@offsetOf(TEB, "ActiveRpcHandle") == 0x50);
+            assert(@offsetOf(TEB, "ThreadLocalStoragePointer") == 0x58);
+            assert(@offsetOf(TEB, "ProcessEnvironmentBlock") == 0x60);
+            assert(@offsetOf(TEB, "LastErrorValue") == 0x68);
+            assert(@offsetOf(TEB, "TlsSlots") == 0x1480);
+        }
     }
 }